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/** \file     Reshape.cpp
    \brief    common reshaper class
*/
#include "Reshape.h"
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <UnitTools.h>
#include "CommonLib/TimeProfiler.h"

#if ENABLE_SIMD_OPT_BUFFER && defined( TARGET_SIMD_X86 )
#include <CommonDefX86.h>
#include <simde/x86/sse.h>
#endif

namespace vvdec
{

// ====================================================================================================================
// Constructor / destructor / create / destroy
// ====================================================================================================================

Reshape::Reshape()
{
  m_invLUT = nullptr;
  m_lumaBD=0;
  m_chromaScale = 1 << CSCALE_FP_PREC;
  m_vpduX = -1;
  m_vpduY = -1;
}

Reshape::~Reshape()
{
  destroy();
}

void  Reshape::createDec(int bitDepth)
{
  //sanity check
  if (m_lumaBD != bitDepth)
  {
    if (m_invLUT )
    {
      xFree( m_invLUT );
      m_invLUT = nullptr;
    }
  }
  m_lumaBD = bitDepth;
  m_reshapeLUTSize = 1 << m_lumaBD;
  m_initCW = m_reshapeLUTSize / PIC_CODE_CW_BINS;
  if( !m_invLUT )
  {
    m_invLUT = ( Pel* ) xMalloc( Pel, m_reshapeLUTSize + 1 );
    memset( m_invLUT, 0, ( m_reshapeLUTSize + 1 ) * sizeof( Pel ) );
  }
  if (m_binCW.empty())
    m_binCW.resize(PIC_CODE_CW_BINS, 0);
  if (m_inputPivot.empty())
    m_inputPivot.resize(PIC_CODE_CW_BINS + 1, 0);
  if (m_fwdScaleCoef.empty())
    m_fwdScaleCoef.resize(PIC_CODE_CW_BINS, 1 << FP_PREC);
  if (m_invScaleCoef.empty())
    m_invScaleCoef.resize(PIC_CODE_CW_BINS, 1 << FP_PREC);
  if (m_reshapePivot.empty())
    m_reshapePivot.resize(PIC_CODE_CW_BINS + 1, 0);
  if (m_chromaAdjHelpLUT.empty())
    m_chromaAdjHelpLUT.resize(PIC_CODE_CW_BINS, 1<<CSCALE_FP_PREC);
}

void  Reshape::destroy()
{
  xFree( m_invLUT );
  m_invLUT = nullptr;
}

void  Reshape::initSlice( int nalUnitLayerId, const PicHeader& picHeader, const VPS* vps )
{
  if( picHeader.getLmcsEnabledFlag() )
  {
    if( nalUnitLayerId != picHeader.getLmcsAPS()->getLayerId() )
    {
      for (int i = 0; vps && i < vps->getNumOutputLayerSets(); i++ )
      {
        bool isCurrLayerInOls = false;
        bool isRefLayerInOls = false;
        for( int j = vps->getNumLayersInOls(i) - 1; j >= 0; j-- )
        {
          if( vps->getLayerIdInOls(i, j) == nalUnitLayerId )
          {
            isCurrLayerInOls = true;
          }
          if( vps->getLayerIdInOls(i, j) == picHeader.getLmcsAPS()->getLayerId() )
          {
            isRefLayerInOls = true;
          }
        }
        CHECK( isCurrLayerInOls && !isRefLayerInOls, "When VCL NAl unit in layer A refers to APS in layer B, all OLS that contains layer A shall also contains layer B" );
      }
    }

    const SliceReshapeInfo& sInfo = picHeader.getLmcsAPS()->getReshaperAPSInfo();
    m_sliceReshapeInfo.sliceReshaperEnableFlag       = true;
    m_sliceReshapeInfo.sliceReshaperModelPresentFlag = true;
    m_sliceReshapeInfo.enableChromaAdj               = picHeader.getLmcsChromaResidualScaleFlag();
    m_sliceReshapeInfo.reshaperModelMaxBinIdx        = sInfo.reshaperModelMaxBinIdx;
    m_sliceReshapeInfo.reshaperModelMinBinIdx        = sInfo.reshaperModelMinBinIdx;
    m_sliceReshapeInfo.maxNbitsNeededDeltaCW         = sInfo.maxNbitsNeededDeltaCW;
    m_sliceReshapeInfo.chrResScalingOffset           = sInfo.chrResScalingOffset;
    memcpy( m_sliceReshapeInfo.reshaperModelBinCWDelta, sInfo.reshaperModelBinCWDelta, sizeof( int ) * ( PIC_CODE_CW_BINS ) );
    constructReshaper();
  }
  else
  {
    m_sliceReshapeInfo.sliceReshaperEnableFlag       = false;
    m_sliceReshapeInfo.enableChromaAdj               = false;
    m_sliceReshapeInfo.sliceReshaperModelPresentFlag = false;
  }
  m_vpduX = -1;
  m_vpduY = -1;
}

bool Reshape::getCTUFlag( const Slice& slice ) const
{
  if( (slice.getSliceType() == I_SLICE) && m_sliceReshapeInfo.sliceReshaperEnableFlag )
  {
    return false;
  }
  else
  {
    return m_sliceReshapeInfo.sliceReshaperEnableFlag;
  }
}



/** compute chroma residuce scale for TU
* \param average luma pred of TU
* \return chroma residue scale
*/
int  Reshape::calculateChromaAdj(Pel avgLuma) const
{
  int iAdj = m_chromaAdjHelpLUT[getPWLIdxInv(avgLuma)];
  return(iAdj);
}

/** compute chroma residuce scale for TU
* \param average luma pred of TU
* \return chroma residue scale
*/
int  Reshape::calculateChromaAdjVpduNei(TransformUnit &tu, const Position pos)
{
  CodingStructure &cs = *tu.cu->cs;
  int xPos = pos.x;
  int yPos = pos.y;
  int ctuSize = cs.sps->getCTUSize();
  int numNeighbor = std::min(64, ctuSize);
  int numNeighborLog = getLog2(numNeighbor);
  if (ctuSize == 128)
  {
    xPos &= ~63;
    yPos &= ~63;
  }
  else
  {
    xPos &= ~( ctuSize - 1 );
    yPos &= ~( ctuSize - 1 );
  }

  if( isVPDUprocessed( xPos, yPos ) )
  {
    return getChromaScale();
  }
  else
  {
    setVPDULoc(xPos, yPos);
    Position topLeft(xPos, yPos);
    CodingUnit *topLeftLuma;
    const CodingUnit *cuAbove, *cuLeft;

    topLeftLuma = cs.getCU( topLeft, CHANNEL_TYPE_LUMA );
    cuAbove     = cs.getCURestricted( topLeftLuma->lumaPos().offset( 0, -1 ), *topLeftLuma, CHANNEL_TYPE_LUMA, topLeftLuma->ly() == yPos ? topLeftLuma : topLeftLuma->above );
    cuLeft      = cs.getCURestricted( topLeftLuma->lumaPos().offset( -1, 0 ), *topLeftLuma, CHANNEL_TYPE_LUMA, topLeftLuma->lx() == xPos ? topLeftLuma : topLeftLuma->left  );

    xPos = topLeftLuma->lumaPos().x;
    yPos = topLeftLuma->lumaPos().y;

    CompArea lumaArea = CompArea(COMPONENT_Y, topLeftLuma->lumaPos(), topLeftLuma->lumaSize());
    PelBuf piRecoY = cs.picture->getRecoBuf(lumaArea);
    ptrdiff_t strideY = piRecoY.stride;
    int chromaScale = (1 << CSCALE_FP_PREC);
    int lumaValue = -1;

    Pel* recSrc0 = piRecoY.bufAt(0, 0);
    const uint32_t picH = tu.cu->cs->picture->lheight();
    const uint32_t picW = tu.cu->cs->picture->lwidth();
    const Pel   valueDC = 1 << (tu.cu->sps->getBitDepth() - 1);
    int32_t recLuma = 0;
    int pelnum = 0;
    if (cuLeft != nullptr)
    {
      for (int i = 0; i < numNeighbor; i++)
      {
        int k = (yPos + i) >= picH ? (picH - yPos - 1) : i;
        recLuma += recSrc0[-1 + k * strideY];
        pelnum++;
      }
    }
    if (cuAbove != nullptr)
    {
      for (int i = 0; i < numNeighbor; i++)
      {
        int k = (xPos + i) >= picW ? (picW - xPos - 1) : i;
        recLuma += recSrc0[-strideY + k];
        pelnum++;
      }
    }
    if (pelnum == numNeighbor)
    {
      lumaValue = (recLuma + (1 << (numNeighborLog - 1))) >> numNeighborLog;
    }
    else if (pelnum == (numNeighbor << 1))
    {
      lumaValue = (recLuma + (1 << numNeighborLog)) >> (numNeighborLog + 1);
    }
    else
    {
      CHECK(pelnum != 0, "");
      lumaValue = valueDC;
    }
    chromaScale = calculateChromaAdj(lumaValue);
    setChromaScale(chromaScale);
    return(chromaScale);
  }
}
/** find inx of PWL for inverse mapping
* \param average luma pred of TU
* \return idx of PWL for inverse mapping
*/
int Reshape::getPWLIdxInv(int lumaVal) const
{
  int idxS = 0;
  for (idxS = m_sliceReshapeInfo.reshaperModelMinBinIdx; (idxS <= m_sliceReshapeInfo.reshaperModelMaxBinIdx); idxS++)
  {
    if (lumaVal < m_reshapePivot[idxS + 1])     break;
  }
  return std::min(idxS, PIC_CODE_CW_BINS-1);
}

/**
-copy Slice reshaper info structure
\param   tInfo describing the target Slice reshaper info structure
\param   sInfo describing the source Slice reshaper info structure
*/
void Reshape::copySliceReshaperInfo(SliceReshapeInfo& tInfo, SliceReshapeInfo& sInfo)
{
  tInfo.sliceReshaperModelPresentFlag = sInfo.sliceReshaperModelPresentFlag;
  if (sInfo.sliceReshaperModelPresentFlag)
  {
    tInfo.reshaperModelMaxBinIdx = sInfo.reshaperModelMaxBinIdx;
    tInfo.reshaperModelMinBinIdx = sInfo.reshaperModelMinBinIdx;
    memcpy(tInfo.reshaperModelBinCWDelta, sInfo.reshaperModelBinCWDelta, sizeof(int)*(PIC_CODE_CW_BINS));
    tInfo.maxNbitsNeededDeltaCW = sInfo.maxNbitsNeededDeltaCW;
    tInfo.chrResScalingOffset = sInfo.chrResScalingOffset;
  }
  tInfo.sliceReshaperEnableFlag = sInfo.sliceReshaperEnableFlag;
  if (sInfo.sliceReshaperEnableFlag)
    tInfo.enableChromaAdj = sInfo.enableChromaAdj;
  else
    tInfo.enableChromaAdj = 0;
}

/** Construct reshaper from syntax
* \param void
* \return void
*/
void Reshape::constructReshaper()
{
  int pwlFwdLUTsize = PIC_CODE_CW_BINS;
  int pwlFwdBinLen = m_reshapeLUTSize / PIC_CODE_CW_BINS;

  for (int i = 0; i < m_sliceReshapeInfo.reshaperModelMinBinIdx; i++)
    m_binCW[i] = 0;
  for (int i = m_sliceReshapeInfo.reshaperModelMaxBinIdx + 1; i < PIC_CODE_CW_BINS; i++)
    m_binCW[i] = 0;
  for (int i = m_sliceReshapeInfo.reshaperModelMinBinIdx; i <= m_sliceReshapeInfo.reshaperModelMaxBinIdx; i++)
    m_binCW[i] = (uint16_t)(m_sliceReshapeInfo.reshaperModelBinCWDelta[i] + (int)m_initCW);

  for (int i = 0; i < pwlFwdLUTsize; i++)
  {
    m_reshapePivot[i + 1] = m_reshapePivot[i] + m_binCW[i];
    m_inputPivot[i + 1] = m_inputPivot[i] + m_initCW;
    m_fwdScaleCoef[i] = ((int32_t)m_binCW[i] * (1 << FP_PREC) + (1 << (getLog2(pwlFwdBinLen) - 1))) >> getLog2(pwlFwdBinLen);
    if (m_binCW[i] == 0)
    {
      m_invScaleCoef[i] = 0;
      m_chromaAdjHelpLUT[i] = 1 << CSCALE_FP_PREC;
    }
    else
    {
      CHECK( m_initCW * (1 << FP_PREC) / m_binCW[i] > (1 << 15) - 1, "Inverse scale coeff doesn't fit in a short!" );
      m_invScaleCoef[i] = (int32_t)(m_initCW * (1 << FP_PREC) / m_binCW[i]);
      m_chromaAdjHelpLUT[i] = (int32_t)(m_initCW * (1 << FP_PREC) / ( m_binCW[i] + m_sliceReshapeInfo.chrResScalingOffset ) );
    }
  }
  for (int lumaSample = 0; lumaSample < m_reshapeLUTSize; lumaSample++)
  {
    int idxYInv = getPWLIdxInv(lumaSample);
    int invSample = m_inputPivot[idxYInv] + ((m_invScaleCoef[idxYInv] * (lumaSample - m_reshapePivot[idxYInv]) + (1 << (FP_PREC - 1))) >> FP_PREC);
    m_invLUT[lumaSample] = Clip3((Pel)0, (Pel)((1 << m_lumaBD) - 1), (Pel)(invSample));
  }
}

void Reshape::rspCtuBcw( CodingStructure& cs, int col, int ln ) const
{
  if( !cs.sps->getUseReshaper() || !m_sliceReshapeInfo.sliceReshaperEnableFlag )
  {
    return;
  }

  const Slice* slice = cs.getCtuData( col, ln ).slice;
  if( !slice->getLmcsEnabledFlag() )
  {
    return;
  }

  PROFILER_SCOPE_AND_STAGE_EXT( 1, g_timeProfiler, P_RESHAPER, cs, CH_L );

  const PreCalcValues& pcv = *cs.pcv;

  int xPos = pcv.maxCUWidth * col;
  int lw = std::min( pcv.lumaWidth - xPos, pcv.maxCUWidth );

  int yPos = ln * pcv.maxCUHeight;
  int lh = std::min( pcv.lumaHeight - yPos, pcv.maxCUHeight );

  PelBuf picYuvRec = cs.getRecoBuf( COMPONENT_Y ).subBuf( Position( xPos, yPos ), Size( lw, lh ) );

#if 1
  if( g_pelBufOP.rspBcw )
    g_pelBufOP.rspBcw( picYuvRec.buf, picYuvRec.stride, picYuvRec.width, picYuvRec.height, m_lumaBD, m_sliceReshapeInfo.reshaperModelMinBinIdx, m_sliceReshapeInfo.reshaperModelMaxBinIdx, m_reshapePivot.data(), m_invScaleCoef.data(), m_inputPivot.data() );
  else
#endif
    g_pelBufOP.applyLut( picYuvRec.buf, picYuvRec.stride, picYuvRec.width, picYuvRec.height, m_invLUT );
}

void Reshape::rspBufFwd( PelBuf& buf ) const
{
  g_pelBufOP.rspFwd( buf.buf, buf.stride, buf.width, buf.height, m_lumaBD, m_initCW, m_reshapePivot.data(), m_fwdScaleCoef.data(), m_inputPivot.data() );
}

}
